slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Black (1851) PowerPoint Presentation
Download Presentation
Black (1851)

Loading in 2 Seconds...

play fullscreen
1 / 44

Black (1851) - PowerPoint PPT Presentation


  • 112 Views
  • Uploaded on

Black (1851). S outhwest P ac I fic Ocean C irculation and Climate E xperiment: SPICE A. Ganachaud JISAO/PMEL/NOAA LEGOS / IRD Nouméa-Toulouse Laboratoire d’Etudes Géophysiques et d’Océanographie Spatiale. W. Kessler (PMEL/NOAA) G. Brassington(BOM) S. Wijffels, K. Ridgway, W. Cai (CSIRO)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Black (1851)' - pandora


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Black (1851)

Southwest PacIfic Ocean Circulation and Climate Experiment:SPICEA. Ganachaud JISAO/PMEL/NOAALEGOS / IRD Nouméa-ToulouseLaboratoire d’Etudes Géophysiques et d’Océanographie Spatiale

W. Kessler (PMEL/NOAA)

G. Brassington(BOM)

S. Wijffels, K. Ridgway, W. Cai (CSIRO)

N. Holbrook (MU)

P. Sutton, M. Bowen (NIWA)

B. Qiu, A. Timmermann (UH)

D. Roemmich, J. Sprintall (SIO),

H. Diamond (NOAA)

S. Cravatte, L. Gourdeau (LEGOS)

P. Eastwood (SOPAC/Fiji)

T. Aung (USP/Fiji)

outline
Outline

A. Thermocline watersB. SPCZC. Impacts D. Context and strategy

SOLOMON IS.

PNG

Solomon

Sea

Coral

Sea

Fiji

VANUATU

N. CALEDONIA

AUSTRALIA

Tasman

Sea

NEW

ZEALAND

interests in the coral and tasman sea circulation

R/V ORSOM III, 1956 interisland flows

Rotschi, Legand, Hamon

Interests in the Coral and Tasman Sea circulation

Cronulla, August 1958Conference on the Coral and Tasman Sea Oceanography

Cairns, August 2005Workshop on theSouthwest Pacific Ocean Circulation and its relation with Climate

slide4
Decadal influences: Thermocline water connection between the subduction zone of the South East Pacific and the equator

Lines show geostrophic streamlines on the isopycnal (courtesy B. Kessler)

a the south pacific thermocline waters
A-The South Pacific "Thermocline" waters

South

Equatorial Current

Salinity maximumZ=100:300m

Temperature/salinity diagram(Argo floats, 2007)

thermocline water currents 0 300m1
Thermocline water currents0-300m

70 % EUC waters

~15 Sv +

~25 Sv

thermocline water currents 0 300m3
Thermocline water currents0-300m

3-Solomon Sea

1-Inflows

2-Tasman Sea

slide10

Thermocline waters: 1-inflow to the Coral Sea

Formation of 3 "jets"

Bifurcation (northward bias in GCM/CGCMs)

Outflows and budget

Bifurcation:

Qu and Lindstrom 2002

Kessler and Gourdeau 2006, 2007

thermocline waters 2 eac and eauc
Thermocline waters: 2-EAC and EAUC

Ridgway and Dunn, (2003); Cai et al. (2003); Bowen et al. (2005)

thermocline waters 2 eac and eauc1
Thermocline waters: 2-EAC and EAUC

Ridgway and Dunn, (2003); Cai et al. (2003); Bowen et al. (2005)

Variability dominates the mean flow

  • Inflows/outflows variations; eddy dynamics
  • Tasman Outflow linkage between S. Pacific gyre and Indian/global circulation
  • Heat balance in the Tasman Sea

SSH variability

C. Ken Ridgway

thermocline waters 3 north coral sea a wbc pathway to feed the euc and itf
Thermocline waters: 3-North Coral Sea:A WBC pathway to feed the EUC and ITF

CARS dynamic Ht relative to 2000m(C. W. Kessler)

ST

GEORGES

SOLOMON

VITIAZ

NVJ

NCJ

Quasi undocumented circulation

WEPOCS cruises, 1985

(Lindstrom et al., 1987; Tsuchiya et al., 1989; Fine et al., 1994)

  • Narrow straits, difficult to model
  • Strong WBC, mixing
  • Strong variability: monsoon, ENSO
the southwest pacific atmosphere
The Southwest Pacific Atmosphere

SPCZ

Trade winds

Trade winds

A

A

b south pacific convergence zone
B-South Pacific Convergence Zone

20th century climate model

COADS cloudiness 1960-1970

High convective activity, precipitation, wind convergence-Dominant convective feature in the Southern Hemisphere-Substantial variability: (intra) seasonal; interannual;Equatorward shift 1976-Unresolved southward bend, poorly modelled -Strong local effects (SSS, oceanic heat content)

c ocean and climate impacts on environment in the southwest pacific

ERSST data (1944-2005)

C-Ocean and climate impacts on environmentin the southwest Pacific

Consequences of ocean and climate fluctuations:

  • Biodiversity, Coral reefs
  • Freshwater-agriculture and health
  • Tropical cyclones
  • Sea surface height

Pacific Island Countries:

Fragile ecosystems, low-lying populated areas, isolated places

Australia and New Zealand:

Climate depends on heat content in the Tasman Sea

Freshwater resources critical

Important changes in biodiversity

SST Trend (°C/century)

slide17

D. Context and strategy:unadapted observations

Sokolov and Rintoul (2000)

Qu and Lindstrom (2002)

Ridgway and Dunn (2003)

Maximenko (2005)

Distribution of the (T,S) casts (Ridgway and Dunn, 2003)

Active Argo floats on 11/15/2007

Sattelite-derived surface currents

slide18

D. Context and strategy:existing large scale programs

UW/CSIRO/IRD

IRD

SIO/CSIRO/IRD

BOM/MF

IMOS/Bluewater and climate

BOM/IRD

slide19

D. Context and strategy:SPICE benefits

Observations:

Ocean and O-A

Modelling:

Ocean and coupled

  • Related programs:
  • Operational oceanography
  • Meteorology
  • Local applications
  • Global observations

Modelling:

Atmosphere

Observations:

Atmosphere

slide20

D. Context and strategy:SPICE benefits

Observations:

Ocean and O-A

Modelling:

Ocean and coupled

  • Related programs:
  • Operational oceanography
  • Meteorology
  • Local applications
  • Global observations

SPICE:

Coordination

Data sharing

National funding

Modelling:

Atmosphere

?

Observations:

Atmosphere

slide21

Modelling strategy: regional zooms

  • Help to design observation / monitoring program
  • Sensitivity experiments
  • Regional applications

CSIRO/BOM

UH/LOCEAN

UH/LEGOS

IRD/NIWA

IRD/CNRS/CNES/IFREMER/METEO-FRANCE/SHOM

slide22

Regional field experiment

2010

2007+

2007+

2005+

2004+

2008

2007+

2008

running

TBS

TBS

spice challenges
SPICE Challenges

"Add-on" Costs 2008-2011

1-Fieldwork:

Shiptime: 1.5month/yr

Wet measurements: $1.6M/yr

HRXT, Air-sea fluxes: funded

2-Modelling:

Infrastructures exist

Specific analyses costs

main objectives and timetable
Main objectives and timetable

A. Ganachaud, W. Kessler, G. Brassington, S. Wijffels, K. Ridgway, W. Cai, N. Holbrook, M. Bowen, P. Sutton, A. Timmermann, B. Qiu, D. Roemmich, J. Sprintall, H. Diamond, S. Cravatte, L. Gourdeau, P. Eastwood, T. Aung

Objective

1-Role of the southwest Pacific in CGCMS (SPCZ, …)

2-Air-sea fluxes and currents

3-Monitoring key quantities

4-Local impacts

2004-2007

-SEC inflow (cruise and glider)

-Gyre dynamics and jets

-Experimental monitoring Solomon Sea

-Model downscaling (ROMS-type)

-Operational prototypes

-SSS-based analyses

2008-2010

-Modelling experiments-Major SPCZ experiments ?

-SEC infow monitoring

-Solomon Sea exploration (model, cruise, moorings, gliders)

-EAC monitoring

-VOS with AWS Hull SST

-Experimental monitoring SEC and Solomon Straits

-Regionally oriented applications and training

spice and clivar
SPICE and CLIVAR

A. Ganachaud, W. Kessler, G. Brassington, S. Wijffels, K. Ridgway, W. Cai, N. Holbrook, M. Bowen, P. Sutton, A. Timmermann, B. Qiu, D. Roemmich, J. Sprintall, H. Diamond, S. Cravatte, L. Gourdeau, P. Eastwood, T. Aung

Relevance

1-Identify key features and their impact on climate simulation on seasonal to decadal timescales

2-Understand pertinent air-sea fluxes and oceanic currents (LLWBCs) to improve climate modelling and prediction

Legacy

1- Long term monitoring of selected features (SST, straits…)

2-Training and transition to local benefits (application of data or operational products)

"Add-on" Costs 2008-2011

1-Fieldwork:

Shiptime: 1.5month/yr

Wet measurements: $1.6M/yr

HRXT, Air-sea fluxes: funded

2-Modelling:

Infrastructures exist

Specific analyses costs

slide27

Interannual influences: ENSO and cyclones

La Niña -Tropical Cyclone Density

Courtesy J. Salinger

downscaling and upscaling
Downscaling…and upscaling

ROMS, 1/12°, nested (Courtesy A. Vega, IRD)

J. Lefevre, IRD

2 ocean and climate impacts on environment in the southwest pacific

ERSST data (1944-2005)

2-Ocean and climate impacts on environmentin the southwest Pacific

Ocean and climate fluctuations:

  • Decadal gyre spin-up: 2°C increase in Tasmania
  • Short time scales: cyclone trajectories or storm surges

SST Trend (°C/century)

Global Climate Model Forecast

Mk3 2070 Surface Temperature

O’Farrell, 2005

2 decadal influences thermocline water connection

Giese et al. 2002:

T on sigma=25

SST

AUSTRALIA

UPWELLING

SST

TO EAST

TO WBC

Equator

8°S, East to West

2-Decadal influences: Thermocline water connection

A temperature anomaly on sigma=25 (EUC core) from the Southeast Pacific preceeds Nino-3 by 7 years

Giese et al. 2002, Schneider 2004, Luo et al. 2005

Izumo et al., 2002: Origins of Nino 3 waters

swpacific and climate eac and the tasman front
SWPacific and ClimateEAC and the Tasman Front

The Southward Pacific WBC which closes the subtropical gyre(Ridgway and Dunn, 2003)

slide33

Glider measurements, 2005(Gourdeau, Kessler, Davis, Sherman)

580 CTD profiles down to 600 meters

Absolute geostrophic velocity field

Temperature

Salinity

NVJ

Gourdeau et al. 2007

NJC

slide34

1-Modeling strategy: regional zooms

  • Help to design observation then monitoring program
  • Sensitivity experiments
  • Regional applications

High resolution global/regional ocean, atmosphere and climate models

Blue Link (CSIRO/BOM)

ROMS/Mercator (IRD Nouméa)

slide35

Towards a large scale field experimentExisting observations

Sokolov and Rintoul (2000)

Qu and Lindstrom (2002)

Ridgway and Dunn (2003)

Maximenko (2005)

Active Argo floats on 08/17/2007

Distribution of the (T,S) casts (Ridgway and Dunn, 2003)

Sattelite-derived surface currents

slide36

ERSST data (1944-2005)

2: EAC and the Tasman Front

Interannual Variability

(Sea level anomaly)

1996

2000

SST Trend (°C/century)

Global Climate Model Forecast

Mk3 2070 Surface Temperature

O’Farrell, 2005

interannual influences thermocline transport modulation
Interannual influences: thermocline transport modulation

Courtesy B. Kessler

  • Interannual time scale:

El Niño influences the SW Pacific Circulation

(Delcroix and hénin, 1989; Sprintall et al., 1995; Gouriou and Delcroix, 2002)

3 north coral sea a wbc pathway to feed the euc and itf
3-North Coral Sea:A WBC pathway to feed the EUC and ITF
  • Narrow straits, difficult to model
  • Strong WBC, mixing
  • Strong variability: monsoon, ENSO

0-200m SADCP currents, May 1993

Blue: 2007 glider trajectory(C. W. Kessler)

main objectives and timetable1
Main objectives and timetable

A. Ganachaud, W. Kessler, G. Brassington, S. Wijffels, K. Ridgway, W. Cai, N. Holbrook, M. Bowen, P. Sutton, A. Timmermann, B. Qiu, D. Roemmich, J. Sprintall, H. Diamond, S. Cravatte, L. Gourdeau, P. Eastwood, T. Aung

Objective

1-Role of the southwest Pacific in CGCMS (SPCZ, …)

2-Air-sea fluxes and currents

3-Monitoring key quantities

4-Local impacts

2004-2007

-SEC inflow (cruise and glider)

-Gyre dynamics and jets

-Experimental monitoring Solomon Sea

-Model downscaling (ROMS-type)

-Operational prototypes

-SSS-based analyses

2008-2010

-Modelling experiments-Major SPCZ experiments ?

-SEC infow monitoring

-Solomon Sea exploration (model, cruise, moorings, gliders)

-EAC monitoring

-VOS with AWS Hull SST

-Experimental monitoring SEC and Solomon Straits

-Regionally oriented applications and training

SPCZ/ocean

Session AGU 2007

slide40

1-Thermocline water inflow to the Coral Sea

162.5°E zonal velocity (blue=westward)

TO EAC

TO NQC

NVJ

NCJ

SCJ

Bifurcation:

Qu and Lindstrom 2002

Kessler and Gourdeau 2006, 2007

Formation of 3 "jets"

Bifurcation (northward bias in GCM/CGCMs)

Outflows and budget

slide42

Towards a regional field experiment

2010

2007+

2007+

2005+

2004+

2008

slide43

Towards a regional field experiment

2010

2007+

2007+

2005+

2004+

2008

2007+

2008

running

TBS

TBS

spice challenges1
SPICE Challenges

Modelling strategy

Existing programs

Ocean field experiment

SPCZ process study (?)